Whether a given (documentName, type) pair is a fenced/experimental type.
(documentName, type)
The Foundry document name (e.g. "Actor").
"Actor"
The document sub-type value (e.g. "cohort").
"cohort"
true when the type is listed in FENCED_TYPES.
true
Whether a given
(documentName, type)pair is a fenced/experimental type.